static int GetLength(Record record)
{
int nLength = 0;
if (record == null)
return 0;
if (record.Path != null)
{
nLength += record.Path.Length;
nLength += PACKAGE_UNIT_SIZE; // 估计 20 个 bytes 的额外消耗
}
if (record.Keys != null)
{
nLength += GetLength(record.Keys);
nLength += PACKAGE_UNIT_SIZE; // 估计 20 个 bytes 的额外消耗
}
if (record.Cols != null)
nLength += GetLength(record.Cols);
if (record.RecordBody != null)
nLength += GetLength(record.RecordBody);
nLength += PACKAGE_UNIT_SIZE; // 估计 20 个 bytes 的额外消耗
return nLength;
}
// 从结果集中提取指定范围的记录
// parameter:
// lStart 开始序号
// lLength 长度. -1表示从lStart到末尾
// strLang 语言
// strStyle 样式,以逗号分隔，id:表示取id,cols表示取浏览格式
// 如果包含 format:cfgs/browse 这样的子串，表示指定浏览格式
// aRecord 得到的记录数组，成员为类型为Record
// strError out参数，返回出错信息
// result:
// -1 出错
// >=0 结果集的总数
public long API_GetRecords(
DpResultSet resultSet,
long lStart,
long lLength,
string strLang,
string strStyle,
out Record[] records,
out string strError)
{
records = null;
strError = "";
// DpResultSet resultSet = this.DefaultResultSet;
if (resultSet == null)
{
strError = "GetRecords()出错, resultSet 为 null";
return -1;
}
long lTotalPackageLength = 0; // 累计计算要输出的XML记录占据的空间
long lOutputLength;
// 检查lStart lLength和resultset.Count之间的关系,
// 和每批返回最大元素数限制, 综合得出一个合适的尺寸
// return:
// -1 出错
// 0 成功
int nRet = ConvertUtil.GetRealLength((int)lStart,
(int)lLength,
(int)resultSet.Count,
SessionInfo.MaxRecordsCountPerApi,//nMaxCount,
out lOutputLength,
out strError);
if (nRet == -1)
return -1;
bool bKeyCount = StringUtil.IsInList("keycount", strStyle, true);
bool bKeyID = StringUtil.IsInList("keyid", strStyle, true);
bool bHasID = StringUtil.IsInList("id", strStyle, true);
bool bHasCols = StringUtil.IsInList("cols", strStyle, true);
bool bHasKey = StringUtil.IsInList("key", strStyle, true);
if (bKeyID == true
&& bHasID == false && bHasCols == false && bHasKey == false)
{
strError = "strStyle包含了keyid但是没有包含id/key/cols中任何一个，导致API不返回任何内容，操作无意义";
return -1;
}
bool bXml = StringUtil.IsInList("xml", strStyle, true);
bool bWithResMetadata = StringUtil.IsInList("withresmetadata", strStyle, true);
bool bTimestamp = StringUtil.IsInList("timestamp", strStyle, true);
bool bMetadata = StringUtil.IsInList("metadata", strStyle, true);
string strFormat = StringUtil.GetStyleParam(strStyle, "format");
List<Record> results = new List<Record>(100);
long lPos = -1; // 中间保持不透明的值
for (long i = 0; i < lOutputLength; i++)
{
DpRecord dpRecord = null;
long lIndex = lStart + i;
if (lIndex == lStart)
{
dpRecord = resultSet.GetFirstRecord(
lIndex,
false,
out lPos);
}
else
{
// 取元素比[]操作速度快
dpRecord = resultSet.GetNextRecord(
ref lPos);
}
if (dpRecord == null)
break;
Record record = new Record();
if (bKeyCount == true)
{
record.Path = dpRecord.ID;
record.Cols = new string[1];
record.Cols[0] = dpRecord.Index.ToString();
#if NO
lTotalPackageLength += record.Path.Length;
lTotalPackageLength += record.Cols[0].Length;
if (lTotalPackageLength > QUOTA_SIZE
&& i > 0)
{
// 响应包的尺寸已经超过 1M，并且已经至少包含了一条记录
break;
}
#endif
goto CONTINUE;
}
DbPath path = new DbPath(dpRecord.ID);
Database db = this.app.Dbs.GetDatabaseSafety(path.Name);
if (db == null)
{
strError = "GetDatabaseSafety()从库id '" + path.Name + "' 找数据库对象失败";
return -1;
}
// 如果有必要获得记录体
string strXml = "";
string strMetadata = "";
byte[] baTimestamp = null;
if (bXml == true || bTimestamp == true || bMetadata == true)
{
// 获得一条记录的 XML 字符串
// return:
// -1 出错
// -4 未找到记录
// -10 记录局部未找到
// 0 成功
long lRet = GetXmlBody(
db,
path.ID,
bXml,
bTimestamp,
bMetadata,
bWithResMetadata,
out strXml,
out strMetadata,
out baTimestamp,
out strError);
if (lRet <= -1)
{
record.RecordBody = new RecordBody();
record.RecordBody.Xml = strXml;
record.RecordBody.Metadata = strMetadata;
record.RecordBody.Timestamp = baTimestamp;
Result result = new Result();
result.Value = -1;
result.ErrorCode = KernelApplication.Ret2ErrorCode((int)lRet);
result.ErrorString = strError;
record.RecordBody.Result = result;
goto CONTINUE;
// return lRet;
}
#if NO
lTotalPackageLength += strXml.Length;
if (string.IsNullOrEmpty(strMetadata) == false)
lTotalPackageLength += strMetadata.Length;
if (baTimestamp != null)
lTotalPackageLength += baTimestamp.Length * 2;
if (lTotalPackageLength > QUOTA_SIZE
&& i > 0)
{
// 响应包的尺寸已经超过 1M，并且已经至少包含了一条记录
break;
}
#endif
record.RecordBody = new RecordBody();
record.RecordBody.Xml = strXml;
record.RecordBody.Metadata = strMetadata;
record.RecordBody.Timestamp = baTimestamp;
}
if (bKeyID == true)
{
// string strID = "";
string strKey = "";
// strID = dpRecord.ID;
strKey = dpRecord.BrowseText;
/*
string strText = dpRecord.ID;
nRet = strText.LastIndexOf(",");
if (nRet != -1)
{
strKey = strText.Substring(0, nRet);
strID = strText.Substring(nRet + 1);
}
else
strID = strText;
* */
if (bHasID == true)
{
// GetCaptionSafety()函数先找到指定语言的库名;
// 如果没有找到,就找截短形态的语言的库名;
// 再找不到,就用第一种语言的库名。
// 如果连一种语言也没有，则返回库id
record.Path = db.GetCaptionSafety(strLang) + "/" + path.CompressedID;
// lTotalPackageLength += record.Path.Length;
}
if (bHasKey == true)
{
record.Keys = BuildKeyFromArray(strKey);
// lTotalPackageLength += GetLength(record.Keys);
}
if (bHasCols == true)
{
string[] cols;
nRet = db.GetCols(
strFormat,
path.ID10,
strXml,
0,
out cols);
// 2013/1/14
if (nRet == -1)
{
if (cols != null && cols.Length > 0)
strError = cols[0];
else
strError = "GetCols() error";
return -1;
}
record.Cols = cols;
// lTotalPackageLength += nRet;
}
goto CONTINUE;
}
{
if (bHasID == true)
{
// GetCaptionSafety()函数先找到指定语言的库名;
// 如果没有找到,就找截短形态的语言的库名;
// 再找不到,就用第一种语言的库名。
// 如果连一种语言也没有，则返回库id
record.Path = db.GetCaptionSafety(strLang) + "/" + path.CompressedID;
// lTotalPackageLength += record.Path.Length;
}
// 在不是keyid的风格下(例如keycount，空)，cols全部是浏览列
if (bHasCols == true)
{
string[] cols;
nRet = db.GetCols(
strFormat,
path.ID10,
strXml,
0,
out cols);
// 2013/1/14
if (nRet == -1)
{
if (cols != null && cols.Length > 0)
strError = cols[0];
else
strError = "GetCols() error";
return -1;
}
record.Cols = cols;
// lTotalPackageLength += nRet;
}
}
CONTINUE:
lTotalPackageLength += GetLength(record);
if (lTotalPackageLength > QUOTA_SIZE
&& i > 0)
{
// 响应包的尺寸已经超过 1M，并且已经至少包含了一条记录
break;
}
// records[i] = record;
results.Add(record);
Thread.Sleep(0); // 降低CPU耗用?
}
records = new Record[results.Count];
results.CopyTo(records);
return resultSet.Count;
}
// 获得一批记录的浏览格式
// 目前情况是：除了数据库名出错以外，其他小错不会终止循环。浏览的第一列放了表示错误的字符串。
// parameter:
// paths 记录路径数组
// strStyle 风格
// aRecord 得到的记录数组，成员为类型为Record
// result:
// -1 出错
// 0 成功
public int API_GetBrowse(string[] paths,
string strStyle,
out Record[] records,
out string strError)
{
records = null;
strError = "";
//定义一个最大数量 ,应该是用尺寸，这里暂时用数组个数计算
//int nMaxCount = 100;
bool bHasID = StringUtil.IsInList("id", strStyle);
bool bHasCols = StringUtil.IsInList("cols", strStyle);
bool bXml = StringUtil.IsInList("xml", strStyle, true);
bool bWithResMetadata = StringUtil.IsInList("withresmetadata", strStyle, true);
bool bTimestamp = StringUtil.IsInList("timestamp", strStyle, true);
bool bMetadata = StringUtil.IsInList("metadata", strStyle, true);
string strFormat = StringUtil.GetStyleParam(strStyle, "format");
long lTotalPackageLength = 0; // 累计计算要输出的XML记录占据的空间
List<Record> results = new List<Record>(100);
for (long i = 0; i < paths.Length; i++)
{
Record record = new Record();
string strPath = paths[i];
DbPath path = new DbPath(strPath);
Database db = this.app.Dbs.GetDatabaseSafety(path.Name);
if (db == null)
{
strError = "没有找到数据库'" + path.Name + "'，换语言版本时出错";
return -1;
}
if (bHasID == true)
{
record.Path = strPath;
}
if (bHasCols == true)
{
string[] cols;
int nRet = db.GetCols(
strFormat,
path.ID10,
"",
0,
out cols);
if (nRet == -1)
{
if (cols != null && cols.Length > 0)
strError = cols[0];
else
strError = "GetCols() error";
return -1;
}
record.Cols = cols;
}
// 如果有必要获得记录体
string strXml = "";
string strMetadata = "";
byte[] baTimestamp = null;
if (bXml == true || bTimestamp == true || bMetadata == true)
{
long lRet = GetXmlBody(
db,
path.ID,
bXml,
bTimestamp,
bMetadata,
bWithResMetadata,
out strXml,
out strMetadata,
out baTimestamp,
out strError);
if (lRet <= -1)
return (int)lRet;
#if NO
lTotalPackageLength += strXml.Length;
if (lTotalPackageLength > QUOTA_SIZE
&& i > 0)
{
// 响应包的尺寸已经超过 1M，并且已经至少包含了一条记录
break;
}
#endif
record.RecordBody = new RecordBody();
record.RecordBody.Xml = strXml;
record.RecordBody.Metadata = strMetadata;
record.RecordBody.Timestamp = baTimestamp;
}
lTotalPackageLength += GetLength(record);
if (lTotalPackageLength > QUOTA_SIZE
&& i > 0)
{
// 响应包的尺寸已经超过 1M，并且已经至少包含了一条记录
break;
}
results.Add(record);
Thread.Sleep(0); // 降低CPU耗用?
}
/*
if (paths.Length <= SessionInfo.MaxRecordsCountPerApi)
records = new Record[paths.Length];
else
records = new Record[SessionInfo.MaxRecordsCountPerApi];
* */
records = new Record[results.Count];
results.CopyTo(records);
return 0;
}
